About the Skill:
Animal Lore affects your ability to control a tamed creature, and also improves the amount of damage you can heal via the Veterinary skill.
Using the skill directly on a tamed creature shows you a listing of its stats, resists, skills and elemental damage distribution. At 100 skill points you may target untamed animals as well, and at 110 you may view information about untamed monsters.
Animal Lore also counts towards your total stable slot limit.
How to train:
Activate the skill via macro or skill button and target a creature. You can gain from repeating upon the same creature.
Animal Lore can also be raised by using the Animal Taming and Veterinary skills. Using veterinary on a tamed pet and getting a passive gain is the preferred method of training. Once you get one passive gain, lock Veterinary and keep vetting your pet for endless gains.